Amentum (AMTM) — insider trading
Industrials
Amentum (AMTM) has 32 reported SEC Form 4 insider transactions in our data (latest 2026-05-06).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-05-06 | Arnette Stephen A | Officer (Chief Operating Officer) | Option exercise / conversion (derivative) | 13,609 | $0.00 | $0 | Form 4 |
| 2026-05-06 | Arnette Stephen A | Officer (Chief Operating Officer) | Shares withheld for taxes / exercise cost | 3,314 | $24.89 | $82.5K | Form 4 |
| 2026-05-06 | Arnette Stephen A | Officer (Chief Operating Officer) | Option exercise / conversion | 13,609 | — | — | Form 4 |
| 2026-05-06 | Bruning Jill L | Officer (Chief Technology Officer) | Option exercise / conversion (derivative) | 9,072 | $0.00 | $0 | Form 4 |
| 2026-05-06 | Bruning Jill L | Officer (Chief Technology Officer) | Shares withheld for taxes / exercise cost | 2,731 | $24.89 | $68.0K | Form 4 |
| 2026-05-06 | Bruning Jill L | Officer (Chief Technology Officer) | Option exercise / conversion | 9,072 | — | — | Form 4 |
| 2026-05-06 | Johnson Travis Barton | Officer (Chief Financial Officer) | Option exercise / conversion (derivative) | 13,609 | $0.00 | $0 | Form 4 |
| 2026-05-06 | Johnson Travis Barton | Officer (Chief Financial Officer) | Shares withheld for taxes / exercise cost | 4,097 | $24.89 | $102.0K | Form 4 |
| 2026-05-06 | Johnson Travis Barton | Officer (Chief Financial Officer) | Option exercise / conversion | 13,609 | — | — | Form 4 |
| 2026-05-06 | Mullen Sean Thomas | Officer (Chief Growth Officer) | Option exercise / conversion (derivative) | 9,072 | $0.00 | $0 | Form 4 |
| 2026-05-06 | Mullen Sean Thomas | Officer (Chief Growth Officer) | Shares withheld for taxes / exercise cost | 2,762 | $24.89 | $68.7K | Form 4 |
| 2026-05-06 | Mullen Sean Thomas | Officer (Chief Growth Officer) | Option exercise / conversion | 9,072 | — | — | Form 4 |
| 2026-05-06 | Heller John E. | Director, Officer (Chief Executive Officer) | Option exercise / conversion (derivative) | 18,145 | $0.00 | $0 | Form 4 |
| 2026-05-06 | Heller John E. | Director, Officer (Chief Executive Officer) | Shares withheld for taxes / exercise cost | 8,184 | $24.89 | $203.7K | Form 4 |
| 2026-05-06 | Heller John E. | Director, Officer (Chief Executive Officer) | Option exercise / conversion | 18,145 | — | — | Form 4 |
| 2026-03-04 | Bruning Jill L | Officer (Chief Technology Officer) | Bona fide gift | 30,000 | $0.00 | $0 | Form 4 |
| 2026-03-02 | Arnette Stephen A | Officer (Chief Operating Officer) | Option exercise / conversion (derivative) | 2,808 | $0.00 | $0 | Form 4 |
| 2026-03-02 | Arnette Stephen A | Officer (Chief Operating Officer) | Shares withheld for taxes / exercise cost | 750 | $30.70 | $23.0K | Form 4 |
| 2026-03-02 | Arnette Stephen A | Officer (Chief Operating Officer) | Option exercise / conversion | 2,808 | — | — | Form 4 |
| 2026-02-17 | St. Mary Michele T | Officer (Chief Legal Officer & GC) | Option exercise / conversion (derivative) | 7,080 | $0.00 | $0 | Form 4 |
| 2026-02-17 | St. Mary Michele T | Officer (Chief Legal Officer & GC) | Shares withheld for taxes / exercise cost | 2,308 | $30.05 | $69.4K | Form 4 |
| 2026-02-17 | St. Mary Michele T | Officer (Chief Legal Officer & GC) | Option exercise / conversion | 7,080 | — | — | Form 4 |
| 2026-02-06 | EBERHART RALPH E | Director | Option exercise / conversion (derivative) | 11,564 | $0.00 | $0 | Form 4 |
| 2026-02-06 | EBERHART RALPH E | Director | Grant / award / vesting | 5,062 | $0.00 | $0 | Form 4 |
| 2026-02-06 | EBERHART RALPH E | Director | Option exercise / conversion | 11,564 | — | — | Form 4 |
| 2026-02-06 | Brooks Vincent K | Director | Option exercise / conversion (derivative) | 11,564 | $0.00 | $0 | Form 4 |
| 2026-02-06 | Brooks Vincent K | Director | Grant / award / vesting | 5,062 | $0.00 | $0 | Form 4 |
| 2026-02-06 | Brooks Vincent K | Director | Option exercise / conversion | 11,564 | — | — | Form 4 |
| 2026-02-06 | Rowland Sandra E. | Director | Option exercise / conversion (derivative) | 11,564 | $0.00 | $0 | Form 4 |
| 2026-02-06 | Rowland Sandra E. | Director | Grant / award / vesting | 5,062 | $0.00 | $0 | Form 4 |
| 2026-02-06 | Rowland Sandra E. | Director | Option exercise / conversion | 11,564 | — | — | Form 4 |
| 2026-02-06 | IRELAND SUSAN LESLIE | Director | Grant / award / vesting | 5,062 | $0.00 | $0 | Form 4 |
Ask the chat about AMTM's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: Amentum (AMTM).
Last updated 2026-05-06 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.